Question
Consider the reaction, 3 I ^-_ (aq) + S _2 O _8^ 2- _ (aq) I _3^- _ (aq) + 2 SO _4^ 2- _ (aq) If the rate of formation of SO _4^ 2- at a particular time is 2.2 10^ -2 \, mol dm ^ -3 \, s ^ -1 . Calculate the rate of consumption of I ^-.
MHT CET
Chemistry
Chemical Kinetics
2026
MHT CET 2026 (19 April Shift 2)
MHT CET Chemistry Question (2026) — Solution
Options
- A. 1.1 10^ -2 \, mol dm ^ -3 \, s ^ -1
- B. 2.2 10^ -2 \, mol dm ^ -3 \, s ^ -1
- C. 3.3 10^ -2 \, mol dm ^ -3 \, s ^ -1
- D. 4.4 10^ -2 \, mol dm ^ -3 \, s ^ -1
Answer
C. 3.3 10^ -2 \, mol dm ^ -3 \, s ^ -1
Step-by-step solution
The rate of reaction is given by: Rate = - 1 3 d[ I ^-] dt = 1 2 d[ SO _4^ 2- ] dt The rate of consumption of I ^- is - d[ I ^-] dt . - d[ I ^-] dt = 3 2 d[ SO _4^ 2- ] dt Substituting the given rate of formation of SO _4^ 2- : - d[ I ^-] dt = 3 2 2.2 10^ -2 - d[ I ^-] dt = 3.3 10^ -2 mol dm ^ -3 s ^ -1 Answer: 3.3 10^ -2 \, mol dm ^ -3 \, s ^ -1
Related: Chemistry — Chemical Kinetics · All PYQ Banks